#!/usr/bin/env python
# -*- coding: utf-8 -*-
# @Time    : 2020/8/22 16:43
# @USER    : Shengji He
# @File    : Snake.py
# @Software: PyCharm
# @Version  : Python-
# @TASK:
import pygame
from pygame.locals import *
import time
import random
import sys
RED_COLOR = pygame.Color(255, 0, 0)
BLACK_COLOR = pygame.Color(0, 0, 0)
WHITE_COLOR = pygame.Color(255, 255, 255)
GREY_COLOR = pygame.Color(150, 150, 150)
LIGHT_COLOR = pygame.Color(220, 220, 220)


def game_over(playSurface, score):
    gameOverFont = pygame.font.Font('./algorithms/images/Arial.ttf', 72)
    gameOverSurf = gameOverFont.render('Game Over', True, GREY_COLOR)
    gameOverRect = gameOverSurf.get_rect()
    playSurface.blit(gameOverSurf, gameOverRect)

    scoreFont = pygame.font.Font('./algorithms/images/Arial.ttf', 48)
    # scoreFont = pygame.font.Font('arial.ttf', 48)
    scoreSurf = scoreFont.render('SCORE: ' + str(score), True, GREY_COLOR)
    scoreRect = scoreSurf.get_rect()
    scoreRect.midtop = (320, 225)
    playSurface.blit(scoreSurf, scoreRect)
    pygame.display.flip()

    time.sleep(5)
    pygame.quit()
    sys.exit()


def App():
    pygame.init()
    fpsClock = pygame.time.Clock()

    playSurface = pygame.display.set_mode((640, 480))

    pygame.display.set_caption('Snake Game')
    # img = pygame.image.load('game.ico')
    # pygame.display.set_icon(img)

    snakePosition = [100, 100]
    snakeSegments = [[100, 100], [80, 100], [60, 100]]
    raspberryPosition = [300, 300]
    raspberrySpawned = 1
    direction = 'right'
    changeDirection = direction
    score = 0
    while True:
        for event in pygame.event.get():
            if event.type == QUIT:
                pygame.quit()
                sys.exit()
            elif event.type == KEYDOWN:
                if event.key == K_RIGHT or event.key == ord('d'):
                    changeDirection = 'right'
                if event.key == K_LEFT or event.key == ord('a'):
                    changeDirection = 'left'
                if event.key == K_UP or event.key == ord('w'):
                    changeDirection = 'up'
                if event.key == K_DOWN or event.key == ord('s'):
                    changeDirection = 'down'
                if event.key == K_ESCAPE:
                    pygame.event.post(pygame.event.Event(QUIT))
        if changeDirection == 'right' and not direction == 'left':
            direction = changeDirection
        if changeDirection == 'left' and not direction == 'right':
            direction = changeDirection
        if changeDirection == 'up' and not direction == 'down':
            direction = changeDirection
        if changeDirection == 'down' and not direction == 'up':
            direction = changeDirection
        if direction == 'right':
            snakePosition[0] += 20
        if direction == 'left':
            snakePosition[0] -= 20
        if direction == 'up':
            snakePosition[1] -= 20
        if direction == 'down':
            snakePosition[1] += 20
        snakeSegments.insert(0, list(snakePosition))

        if snakePosition[0] == raspberryPosition[0] and snakePosition[1] == raspberryPosition[1]:
            raspberrySpawned = 0
        else:
            snakeSegments.pop()
        if raspberrySpawned == 0:
            x = random.randrange(1, 32)
            y = random.randrange(1, 24)
            raspberryPosition = [int(x * 20), int(y * 20)]
            raspberrySpawned = 1
            score += 1

        playSurface.fill(BLACK_COLOR)
        for position in snakeSegments[1:]:
            pygame.draw.rect(playSurface, WHITE_COLOR, Rect(position[0], position[1], 20, 20))
        pygame.draw.rect(playSurface, LIGHT_COLOR, Rect(snakePosition[0], snakePosition[1], 20, 20))
        pygame.draw.rect(playSurface, RED_COLOR, Rect(raspberryPosition[0], raspberryPosition[1], 20, 20))
        pygame.display.flip()
        if snakePosition[0] > 620 or snakePosition[0] < 0:
            game_over(playSurface, score)
        if snakePosition[1] > 460 or snakePosition[1] < 0:
            game_over(playSurface, score)
        for snakeBody in snakeSegments[1:]:
            if snakePosition[0] == snakeBody[0] and snakePosition[1] == snakeBody[1]:
                game_over(playSurface, score)

        if len(snakeSegments) < 40:
            speed = 6 + len(snakeSegments) // 4
        else:
            speed = 16
        fpsClock.tick(speed)


if __name__ == '__main__':
    App()
    print('done')
